Frequencies for first 10,000 rows of med28 variable in nhamcsed2015 dataset :

                         Medication #28 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                          NO ENTRY MADE |      9,995       99.95       99.95
                                  CALAN |          1        0.01       99.96
                               APIXABAN |          1        0.01       99.97
                          NORMAL SALINE |          1        0.01       99.98
                           PROCARDIA XL |          1        0.01       99.99
                              TORSEMIDE |          1        0.01      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017